Just now he ran blindly, his own bank of the Mackenzie alone entering into his calculations.

“I suppose he is,” Mackenzie agreed, although he had many doubts.

Mackenzie1

noun

a river in NW Canada, in the Northwest Territories and Nunavut, flowing northwest from Great Slave Lake to the Beaufort Sea: the longest river in Canada; navigable in summer. Length: 1770 km (1100 miles)

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Mackenzie2

noun

Sir Alexander. ?1755–1820, Scottish explorer and fur trader in Canada. He explored the Mackenzie River (1789) and was the first European to cross America north of Mexico (1793)